/*
 * This software code is (c) 2010 T-Mobile USA, Inc. All Rights Reserved.
 *
 * Unauthorized redistribution or further use of this material is
 * prohibited without the express permission of T-Mobile USA, Inc. and
 * will be prosecuted to the fullest extent of the law.
 *
 * Removal or modification of these Terms and Conditions from the source
 * or binary code of this software is prohibited.  In the event that
 * redistribution of the source or binary code for this software is
 * approved by T-Mobile USA, Inc., these Terms and Conditions and the
 * above copyright notice must be reproduced in their entirety and in all
 * circumstances.
 *
 * No name or trademarks of T-Mobile USA, Inc., or of its parent company,
 * Deutsche Telekom AG or any Deutsche Telekom or T-Mobile entity, may be
 * used to endorse or promote products derived from this software without
 * specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED ON AN "AS IS" AND "WITH ALL FAULTS" BASIS
 * AND WITHOUT WARRANTIES OF ANY KIND.  ALL EXPRESS OR IMPLIED
 * CONDITIONS, REPRESENTATIONS OR WARRANTIES, INCLUDING ANY IMPLIED
 * WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR
 * NON-INFRINGEMENT CONCERNING THIS SOFTWARE, ITS SOURCE OR BINARY CODE
 * OR ANY DERIVATIVES THEREOF ARE HEREBY EXCLUDED.  T-MOBILE USA, INC.
 * AND ITS LICENSORS SHALL NOT BE LIABLE FOR ANY DAMAGES SUFFERED BY
 * LICENSEE AS A RESULT OF USING, MODIFYING OR DISTRIBUTING THIS SOFTWARE
 * OR ITS DERIVATIVES.  IN NO EVENT WILL T-MOBILE USA, INC. OR ITS
 * LICENSORS BE LIABLE FOR LOST REVENUE, PROFIT OR DATA, OR FOR DIRECT,
 * INDIRECT, SPECIAL, CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES,
 * HOWEVER CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY, ARISING OUT
 * OF THE USE OF OR INABILITY TO USE THIS SOFTWARE, EVEN IF T-MOBILE USA,
 * INC. HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
 *
 * THESE TERMS AND CONDITIONS APPLY SOLELY AND EXCLUSIVELY TO THE USE,
 * MODIFICATION OR DISTRIBUTION OF THIS SOFTWARE, ITS SOURCE OR BINARY
 * CODE OR ANY DERIVATIVES THEREOF, AND ARE SEPARATE FROM ANY WRITTEN
 * WARRANTY THAT MAY BE PROVIDED WITH A DEVICE YOU PURCHASE FROM T-MOBILE
 * USA, INC., AND TO THE EXTENT PERMITTED BY LAW.
 */

package javax.microedition.ims.core.sipservice.invite.listener;

import javax.microedition.ims.common.ListenerSupport;
import javax.microedition.ims.core.dialog.Dialog;
import javax.microedition.ims.core.sipservice.TransactionStateChangeEvent;
import javax.microedition.ims.core.transaction.TransactionListener;
import javax.microedition.ims.core.transaction.UnSubscribeOnLogicCompleteAdapter;
import javax.microedition.ims.messages.wrappers.sip.BaseSipMessage;
import javax.microedition.ims.messages.wrappers.sip.UriHeader;

/**
 * Retrieve remote party tag and set into Dialog
 *
 * @author Andrei Khomushko
 */
public class RemotePartyAnnouncedListener extends UnSubscribeOnLogicCompleteAdapter<BaseSipMessage> {
    private final Dialog dialog;

    public RemotePartyAnnouncedListener(
            final ListenerSupport<TransactionListener<BaseSipMessage>> listenerSupport,
            final Dialog dialog) {

        super(listenerSupport);
        this.dialog = dialog;
    }

    
    public void onStateChanged(final TransactionStateChangeEvent<BaseSipMessage> event) {
        super.onStateChanged(event);

        /**
         * AK: The 100 (Trying) response is constructed according to the procedures in Section 8.2.6, 
         *  except that the insertion of tags in the To HEADER field of the response
         *  (when NONE was present in the request) is downgraded from MAY to SHOULD NOT.
         */


        String announcedRemoteTag = getRemotePartyTag(event);

        if (announcedRemoteTag != null) {
            dialog.setRemoteTag(announcedRemoteTag);
        }
    }

    private String getRemotePartyTag(final TransactionStateChangeEvent<BaseSipMessage> event) {
        if (event.getTriggeringMessage() == null) {
            return null;
        }

        final String retValue;

        final UriHeader remoteParty;
        BaseSipMessage msg = event.getTriggeringMessage();
        if (event.getTransaction().getTransactionType().isServer()) {
            remoteParty = msg.getFrom();
        }
        else {
            remoteParty = msg.getTo();
        }
        retValue = remoteParty.getTag();

        return retValue;
    }

    
    public String toString() {
        return "RemotePartyAnnouncedListener [DIALOG=" + dialog + "]";
    }
}
